Retractable pulling rod control device

ABSTRACT

A retractable pulling rod control device, wherein, a concave portion and a through hole are provided on a plug, and a link piece is disposed on said concave portion, such that said link piece is provided with a plurality of protrusion portions exposed outside said through hole; and a first and a second T-shaped link pieces are installed in said through hole and are fastened to each other, said first T-shaped link piece is provided with a first protrusion block, and said second T-shaped link piece is provided with a groove and a second protrusion block, said protrusion portion is fastened correspondingly to said groove, and said protrusion portion is able to slide in said groove in bringing said first and said second T-shaped link pieces into motion in said through hole, hereby achieving the effect of controlling the extension and retraction of each section of a pulling rod.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a pulling rod control device, and inparticular to a retractable pulling rod control device that is capableof controlling the extension and retraction of a luggage trunk pullingrod.

2. The Prior Arts

Nowadays, due to the prosperous and extensive business activitiesbrought about by the rapid economic growth, and fast and convenient masstransportation systems, therefore, people are able to travel to variousplaces around the world to engage in business activities by means ofvarious transportation means, such as vehicle, high-speed train,passenger liner, or airplane. As such, while in the process of travelingor going on a business errand, luggage trunk is utilized to carrypersonal items of daily usage. In order to facilitate dragging andlifting the luggage trunk while travelling, the pulling rod of ordinaryluggage trunk is designed to be retractable.

By way of example, Taiwan Patent Number 524071 disclosed a fastening andlocking device for a multi-section luggage trunk pulling rod. Wherein, aluggage trunk retractable pulling rod structure is disclosed, and thepulling rod provided with a fastening and locking device for positioningis disposed in a pulling rod device for fastening the section tubes, soas to control the extension and retraction of the section tube. However,the structure of this kind of device is quite complicated, and itsassembly is rather difficult, such that the fastening and positioningeffects are not satisfactory when exercising extension and retraction ofthe section tubes.

SUMMARY OF THE INVENTION

In view of the problems and shortcomings of the prior art, the presentinvention proposes a retractable pulling rod control device, of whichthe link structure is simple, and its fastening and positioning areaccurate and precise.

A major objective of the present invention is to provide a retractablepulling rod control device, wherein a link piece can be pressed down toactuate the retraction of the second steel bead, such that each sectionof pulling rod can be extended and retracted, hereby achieving itsfairly simple and convenient application.

Another objective of the present invention is to provide a retractablepulling rod control device, that is simple in structure, light weight,thin profile, compact size, and that can be assembled to the pulling rodstructure easily, therefore, it is quite practical in application.

In order to achieve the above mentioned objective, the present inventionprovides a retractable pulling rod control device, comprising: a plug, apushing piece, a first T-shaped link piece, and a second T-shaped linkpiece. Wherein, a concave portion and a through hole are provided on theplug; the concave portion is used to receive and install the pushingpiece, and the pushing piece is provided with a plurality of protrusionportions and are exposed to the through hole; the first T-shaped linkpiece is provided with a first protrusion block, the second T-shapedlink piece is connected to the first T-shaped link piece, and are bothreceived and installed in the through hole, the second T-shaped linkpiece is provided with a second protrusion block and a plurality ofgrooves, and a protrusion portion of the pushing piece is fastened tothe groove correspondingly, such that the protrusion portion is able toglide in the groove in bringing the first T-shaped link piece and thesecond T-shaped link piece to move in the through hole.

Further scope of the applicability of the present invention will becomeapparent from the detailed descriptions given hereinafter. However, itshould be understood that the detailed descriptions and specificexamples, while indicating preferred embodiments of the presentinvention, are given by way of illustration only, since various changesand modifications within the spirit and scope of the present inventionwill become apparent to those skilled in the art from this detaileddescriptions.

BRIEF DESCRIPTION OF THE DRAWINGS

The related drawings in connection with the detailed descriptions of thepresent invention to be made later are described briefly as follows, inwhich:

FIG. 1 is a perspective view of a structure of a retractable pulling rodcontrol device according to the present invention;

FIG. 2 is an exploded view of a structure of a retractable pulling rodcontrol device according to the present invention;

FIG. 3( a) is a side view of a structure of a retractable pulling rodcontrol device according to the present invention when the link piece isnot pressed down;

FIG. 3( b) is a cross section view of a structure of a retractablepulling rod control device according to the present invention when thelink piece is not pressed down;

FIG. 4( a) is a side view of a structure of a retractable pulling rodcontrol device according to the present invention when the link piece ispressed down;

FIG. 4( b) is a cross section view of a structure of a retractablepulling rod control device according to the present invention when thelink piece is pressed down; and

FIG. 5 is a perspective view of a structure of a retractable pulling rodcontrol device according to the present invention when it is assembledto the retractable pulling rod.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

The purpose, construction, features, functions and advantages of thepresent invention can be appreciated and understood more thoroughlythrough the following detailed description with reference to theattached drawings.

The present invention provides a retractable pulling rod control device,wherein, the first T-shaped link piece and the second T-shaped linkpiece can be brought into retracting into the through hole of a plug bypressing down a push button on a pushing piece, so as to realize theaction of extending and retracting the pulling rod. In the following,the technical characteristics of the present invention will be describedwith reference to the Preferred Embodiment.

Refer to FIG. 1 for a perspective view of a structure of a retractablepulling rod control device according to the present invention, alsorefer to FIG. 2 for an exploded view of a structure of a retractablepulling rod control device according to the present invention. As shownin FIGS. 1 & 2, a concave portion 12 and a through hole 14 are providedon the plug 10, and a ∩ (inverted-U) shaped pushing piece 16 isinstalled in the concave portion 12, this pushing piece 16 is providedwith a plurality of protrusion portions 18 located in the through hole14. The first T-shaped link piece 20 is composed of a first spring 24and a first T-shaped steel bead 26, the first T-shaped steel bead 26 isprovided with a first protrusion block 22, a second spring 44 isinstalled in the first protrusion block 22 connected to the firstT-shaped link piece 20; and the second T-shaped link piece 28 isconnected to the first T-shaped link piece 20. The second T-shaped linkpiece 28 is provided with an opening 34, a second protrusion 30, and aplurality of grooves 32 in a slant direction, such that the firstT-shaped link piece 20 and the second spring 44 installed thereon areable to penetrate together into the opening 34 of the second T-shapedlink piece 28, thus the first T-shaped link piece 20 is fastened to thesecond T-shaped link piece 28, and the protrusion portion 18 of thepushing piece 16 is fastened correspondingly to the groove 32 of thesecond T-shaped link piece 28. When the pushing piece 16 is presseddown, the protrusion portion 18 is made to glide in groove 32, thusbringing the second T-shaped link piece 28 into retracting into thethrough hole 14, and compressing the first spring 24 and the secondspring 44 at the same time in bringing the first T-shaped link piece 20into motion.

In the above descriptions, the structure of retractable pulling rodcontrol device has been described. In the following, the action andprocess will be described concerning when the pushing piece 16 ispressed down, it will bring the second T-shaped link piece 28 intoretracting into the through hole, thus bringing the first T-shaped linkpiece 20 into motion accordingly.

Then, refer to FIGS. 3( a) & 3(b) for a side view and a cross sectionview respectively of a structure of a retractable pulling rod controldevice according to the present invention when the link piece is notpressed down; also refer to FIGS. 4( a) & 4(b) for a side view and across section view respectively of a structure of a retractable pullingrod control device according to the present invention when the linkpiece is pressed down. As shown in the drawings mentioned above, whenthe pushing piece 16 is not subject to an outside force in pushing it tomove downward, the pushing piece 16 is located at the concave portion 12of the plug 10, such that the protrusion portion 18 of the pushing piece16 is fastened to a top end of a slant groove 32 of the second T-shapedlink piece 28, and the second protrusion block 30 is exposed outside thethrough hole 14, and the first T-shaped link piece 20 is received andinstalled in the through hole 14, thus it does not protrude outside thethrough hole 14. When the pushing piece 16 is subjected to an outsideforce and moves gradually downward, the protrusion portion 18 of thepushing piece 16 then moves from the top end of the slant groove 32 toits bottom end, thus bringing the second T-shaped link piece 28 to moveand retract into the through hole 14. Meanwhile, the first spring 24 iscompressed gradually, while the second spring 44 is extended gradually,and at the same time bringing the first T-shaped link piece 20 to movebackward along the through hole 14.

When the pushing piece 16 is pressed down to the bottom of the concaveportion 12, its protrusion portion 18 slides to the bottom end of thegroove 32, thus the second protrusion block 30 retracts completely intothe through hole 14 , therefore, one end of the first T-shaped linkpiece 20 is exposed at the other side of the thorough hole 14. Whenreleasing the downward force applied on the pushing piece 16, the firstT-shaped link piece 20 and the second T-shaped link piece 28 will bounceback by means of the spring force of the first spring 24 and the secondspring 44, hereby bringing the pushing piece 16 back to its positionbefore it is pressed down.

Finally, refer to FIG. 5 for a perspective view of a structure of aretractable pulling rod control device according to the presentinvention when it is assembled to a retractable pulling rod. As shown inFIG. 5, a plug 10 is connected to a first tube body 36 by means of a pin38, on the first tube body is provided with a push button 42, that isinstalled at and is linked to the pushing piece 16 of the plug 10; thesecond tube body 40 is sleeved on and connected to the first tube body36, and is wrapped around the plug 10, such that it is fastened to thesecond protrusion block 30 of the second T-shaped link piece 28. Uponpressing down the push button 42, the pushing piece 16 is pushed down,thus the second protrusion block 30 will retract inward and will not befastened to the second tube body 40, such that the first tube body 36 isable to slide and extend or retract along the second tube body 40; whenreleasing, the pressed down push button 42, the second protrusion block30 will bounce out to fasten to the second tube body 40, thus fixing theretractable pulling rod to a certain height.

Through the application of the retractable pulling rod control device ofthe present invention, such that when it is desired to extend or retractthe pulling rod of the luggage trunk, a push button on the pulling rodcan be pressed down to actuate the pushing piece 16 on the plug 10, thusactivating the retraction of the second bead 28, and realizing easilythe extension/retraction of each section of the pulling rod. Therefore,the characteristics of the present invention are that the retractablepulling rod control device is simple in its structure, and it can beassembled easily to the retractable pulling rod, thus it is quitepractical in its application.

The above detailed description of the preferred embodiment is intendedto describe more clearly the characteristics and spirit of the presentinvention. However, the preferred embodiments disclosed above are notintended to be any restrictions to the scope of the present invention.Conversely, its purpose is to include the various changes and equivalentarrangements which are within the scope of the appended claims.

1. A retractable pulling rod control device, comprising a plug, having aconcave portion and a through hole disposed thereon; a pushing piece,disposed in said concave portion, and is provided with a plurality ofprotrusion portions, and said protrusion portions are exposed outsidesaid through hole; a first T-shaped link piece, received and installedin said through hole, and is provided with a first protrusion block; anda second T-shaped link piece, connected to said first T-shaped linkpiece and is received and installed in said through hole, and isprovided with a second protrusion block and a plurality of grooves, saidprotrusion portion of said pushing piece is fastened correspondingly tosaid groove, and said protrusion portion slides in said groove inbringing said second T-shaped link piece into moving in said thoroughhole, thus bringing said first T-shaped link piece into motion.
 2. Theretractable pulling rod control device as claimed in claim 1, whereinsaid groove is disposed slantingly in said second T-shaped link piece.3. The retractable pulling rod control device as claimed in claim 1,wherein said first T-shaped link piece includes a first spring and afirst T-shaped steel bead, said first spring is sleeved around saidfirst T-shaped steel bead, and are both disposed in said through hole.4. The retractable pulling rod control device as claimed in claim 1,wherein said second T-shaped link piece is provided with an opening,such that said first T-shaped link piece penetrates into said opening,and is fastened and connected to said second T-shaped link piece.
 5. Theretractable pulling rod control device as claimed in claim 4, furthercomprising: a second spring, installed on said first protrusion block,and is connected to said first T-shaped link piece, and it penetratestogether with said first T-shaped link piece into said opening of saidsecond T-shaped link piece.
 6. The retractable pulling rod controldevice as claimed in claim 1, further comprising: a first tube body,said plug is installed on said first tube body.
 7. The retractablepulling rod control device as claimed in claim 6, further comprising: apin, said plug and said first tube body are connected by means of saidpin.
 8. The retractable pulling rod control device as claimed in claim6, further comprising: a second tube body, sleeved around and connectedto said first tube body and is wrapped around said plug, and is fastenedto said second protrusion block.
 9. The retractable pulling rod controldevice as claimed in claim 6, further comprising: a push button,installed on said first tube body, and is connected to said pushingpiece.